Fighters get a Ability Score increase at 6th but no other class does. Also rogue’s as well?!

just discovered that Fighters get a Ability Score increase at 6th but no other class does. Is this correct or a typo? Also rogue's as well?! I'm surprised this is never mentioned in the PHB as to why they're different?So that means they can take more Feats?

Ability Score Improvement is a class feature. Every time you get it from your class, you have the option of taking a feat instead, assuming your group is using the feat option. #DnDhttps://t.co/r02hWFtV6r